patch applied (cabal): Also set -stubdir for haddock-stomping workaround

[Duncan Coutts]

Sun Apr 11 12:45:50 PDT 2010  Duncan Coutts <duncan at haskell.org>
  * Also set -stubdir for haddock-stomping workaround
  Probably needed in the case of foreign exports and TH.

    M ./Distribution/Simple/Haddock.hs -2 +4

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=cabal;a=darcs_commitdiff;h=20100411194550-adfee-1555dc68d07d0864456589b36d72c9fae4496b08.gz